How to make Coke Material in blender
Not sure how your looks so I dont know if mine is more what you are looking for, but this is how I would set it up. 




Use the principled shader with transmission all the way up (for glass).

I used a mix RGB with a noise factor to break up the color a little bit. 

I used an emission shader for the volume with a noise texture (to get those light color swirls). I tried using a volume scatter/absorbtion but I wasn't liking the look it gave me plus the render times shot way up (so the emission shader worked for me).



Then I just added a particle system for the bubbles, and I threw in some Ice Cubes.